Day in Engineering History Archive - June 20

Note: These historical tidbits have been collected from various sources, mostly on the Internet. As detailed in
this article,
there is a lot of wrong information that is repeated hundreds of times because most websites do not validate with authoritative
sources. On RF Cafe, events with hyperlinks have been verified.

Please submit significant historical events and
dates for inclusion in these lists. I will be glad to include your name and birthday. Please do not submit your death
date ;-) A couple years ago, I began commemorating the birthdays of notable people and events with
special RF Cafe logos. Where available, I like to use images
from postage stamps from the country where the person or event occurred.

June 20

1918: The X-ray expert
Dr. Eugene W. Caldwell, died of X-ray burns in NY. 1840:
Samuel Morse was granted a patent for telegraphy signals. 1935: The
U.S. Army Air Force was
established and headed by Gen. Hap Arnold, replacing the Army Air Corps. 1939: The world's first airplane to be
propelled solely by a liquid-fuelled rocket, the
Heinkel He-176, flew for first time. 1942:
Japanese submarine I-25
launched an attack on Fort Stevens, located on the Columbia River in OR. 1950: Willie Mays graduated from high school
and immediately signed with the New York Giants. 1977: The Trans-Alaska Pipeline began carrying oil from the Arctic
Ocean to Prince William Sound. 1980: "Blues Brothers"
with Dan Aykroyd and John Belushi premiered. 1981:
Henri-Gaston Busignies,
developer of HF (high frequency) direction finding equipment, died. 1996: Westinghouse Electric agreed to buy
Infinity Broadcasting for $4.9 billion.
2005: Jack
Kilby, inventor of the integrated circuit, died. 2006: IBM and the Georgia Institute of Technology demonstrated
the first silicon-based
transistor
that operates at 500 GHz.